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I really need that dual extrusion feature. After some searching I found a few different approaches to solving this. However, I did not find anything conclusive. I was curious to start a thread on "turn key solutions". Something that someone can source easily, install easily, and be dual printing relatively easy.

short answer, because it just doesn't work, save yourself the frustration.

longer answer;

1st problem to avoid is your part getting knocked over by the nozzle not in use, you ether need a lifting system, lifting the nozzle not in use, or you need a system with separate nozzles parking the nozzle not in use out of the way.

2th problem to solve is the oozing of material, even when you solved the 1st issue. you can do this f.e by cooling the nozzle not in use, or just let it drip and prime the nozzle every time you start using it.

All the solutions for dual material have one thing in common, your printing will get much slower. The solution I had on my UM2, the magnetic head change did work, but it needed constant monitoring and cleaning and the fail-rate was high. I stopped using it, it was a great experiment but I don't have the patience for it and moved on to other experiments....

There are printers on the market that claim dual extrusion, I've seen f.e. the new felix printer, it has a lifting system that seems to work pretty good and cools and heats between each change, making the print times increase enormously. If the process would be totally reliable (I have no idea what the fail rate is) this would be less of an issue. I would not dear to leave my magnetic head changer system on over night. Another available system with 2 separate heads mounted on one rail is the BCN3d sigma. https://www.bcn3dtechnologies.com/en/catalog/bcn3d-sigma

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I actually printed something the other day with the new Cura 1.99 and it had a massive flat overhang. I used support roof and it came out super smooth. I was really impressed. Support came off really easy as well.

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Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.